Final answer:
Parenteral is the form of drug administration that is administered via routes other than the GI tract.
Step-by-step explanation:
The form of drug administration that is administered via routes other than the GI tract is parenteral. Parenteral administration refers to the introduction of a drug into the body through methods such as intravenous or intramuscular injection. This route is preferred when a drug is not easily absorbed from the GI tract or when immediate and high plasma levels of the drug are needed.